net: stmmac: dwmac-meson8b: fix meson8b_devm_clk_prepare_enable()

There are two problems with meson8b_devm_clk_prepare_enable(),
introduced in commit a54dc4a490 ("net: stmmac: dwmac-meson8b:
Make the clock enabling code re-usable"):

- It doesn't pass the clk argument, but instead always the
  rgmii_tx_clk of the device.

- It silently ignores the return value of devm_add_action_or_reset().

The former didn't become an actual bug until another user showed up in
the next commit 9308c47640 ("net: stmmac: dwmac-meson8b: add support
for the RX delay configuration"). The latter means the callers could
end up with the clock not actually prepared/enabled.

Fixes: a54dc4a490 ("net: stmmac: dwmac-meson8b: Make the clock enabling code re-usable")
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20221104083004.2212520-1-linux@rasmusvillemoes.dk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

@@ -272,11 +272,9 @@ static int meson8b_devm_clk_prepare_enable(struct meson8b_dwmac *dwmac,
 	if (ret)
 		return ret;
 
-	devm_add_action_or_reset(dwmac->dev,
-				 (void(*)(void *))clk_disable_unprepare,
-				 dwmac->rgmii_tx_clk);
-
-	return 0;
+	return devm_add_action_or_reset(dwmac->dev,
+					(void(*)(void *))clk_disable_unprepare,
+					clk);
 }
 
 static int meson8b_init_rgmii_delays(struct meson8b_dwmac *dwmac)